Sharp freezing unit



y 23, 1931- L. G. COPEMAN SHARP FREEZING tmi'r Filed April 24, 1930 war 652 INVENTOR. [Z070 fflfilmw [Mi/viz A TTORN Y.

' frigerating units.

Patented July 28, 1931' worn a, cormmn, or units, mcnrelm,

comm, or rnm'r, MICHIGAN,

A coaroaarron or uicnremr smnr raunznio um'r Application filed April 24, 1930. Serial in. 440,009.

. This invention relates to a sharp freezing .unit and has to do,-particularly with an extremely sim le, inexpensive and compact cooling unit aving a sharp freezing chambet;

Ellicient heat transfer as well as hold-over capacity has become a major problem in connection. with refrigerating systems of the used in connection with domestic re- The present invention has to do with a cooling unit which is much less expensive than the general type nowin use and which at the same time provides for maximum heat transfer as well as hold-over properties.

More specifically, the presentinvention has to do wi h the forming of the interior walls of the char freezing chamber,and

, also other walls, 0 cylindrical members, or I) cylindrical tubing'as the case may be, so as to provide for relatively inexpensive construction and also to form the interior wall of the sharp freezing chamber in a novel manner so as to prevent collapsing. In other words, to provide a flat surface for the sharp freezing container the cylindrical inner walls of the unit must be deformed in part from their true cylindrical shape and I have previded a nove manner of accomso plishing this change in shape while at the same time strengthening the inner shell against collapsing.

Gthe'r features of the'invention reside in novel details of construction as will be more clearly brought out in the specification.

In the drawings: v

Fig. 1 is a vertical sectional view illustrating one manner of carryin out the invention and showing in particular the shape or the inner shell and the arrangement of the surroundin shells for carr 'ng the refrigcrating me iu'm. and the ho d-over medium.

Fig. 2 is a sectional view taken on line 2-2 is "sign.

$ Fi 3 is a sectional view similar tollig l;

' but iilustratin a modified formhf the invention whe y flat surfaces at 350th the top and-bottom ar Y of 3 e sharp ing vchamber. a

Fig. 4 is a diagrammatic viewfillustrating of what is known as o coolmg unit in the usual mechanical refrigeratiiig system.

Fig. 5 is a diagrammatic view illustrating another way of forming the sharp'freezing chamber wherein the inner wall and xssrenoa r0 cornman nanonuronms the eneral manner of positioning my novel outer wall are formed from a single piece of 7 sheet metal.

The entire coolin unit or lowside ma be generally designate land in its general fiirm consists of an outer shell 2, an mtermediate shell 3, and an inner shell 4.

In the preferred simple form shown in Fig 1 wherein the cooling unit-is adapted to. receive a single sharp freezing container, the innershell 4 is preferably cylindrical with the exception of a bottom flat surface 5. Of

course, the inner shell 4 could be with suitable rooves for receiving t nlrovided e sharp freezing container but with this arrangement the contacting surface between the container and the walls of the sharpIfreezing chamber would be quite limited. owever, it will be obvious that by providing a flattened wall 5 that the entire sharp freezing container will rest on this flat bottom wall with the result that the surface area of contact will be greatly enlarged which will. in turn result in a p more complete and rapid heat transfer. The space between the inner shell 4 and the intermediate shell with a refrigerant 6 which may be either liquid or gas, as it will be obvious that the cooling unit is well adapted to either the flooded type 0' dry system of refrigeration.- The space between the intermediate shell 3 and the outer shell 2 is preferably filled with artificial stone 7.. This stone may heformed -chlcride cement or may be formed of any ot er similar materials which provide relatively good conductivity as Well as good hold-over properties.

This material 7 is preferably plastic when walls with suitable caps 8, as best shown in ed Fig.2, it will be obvious that the stone lining '7 be completely sealed with the result that a relatively cheap and even a relatively porous stone can be used with good results.

3 is preferably filled.

Mll

The outer shell 3 being cylindrical in form and reinforced by the stone lining 7 will obviously withstand any pressures created by the expanding or evaporating refrigerant. However, the lnner shell 4 being formed by providing a flat bottom wall 4.- would obvicontact with the walls 3.

erant.

\ nated 12 and 13. These By welding the legs 9 and 10 together, as best shown in Fig. 1, and by welding the flanges 11 to the intermediate wall 3, it will be obvious that the bottom wall 5 is materially strengthened against any strains which might be caused by the pressure of the refrigrectly positioning the sharp freezing chamber formed by the walls 4 and 5.

A modified form of the invention is disclosed in Fig. 3 wherein the portion forming the actual sharp freezing chambers is formed in two halves which may be generally desighalves may be provided with flange members 9 and 10 similar to the structure shown in Fig. 1 and the upper ortion of the chamber or chambers formed y the halves is so fabricated as to provide a fiat wall 14 similar to the wall 5. Suitable flange members 15 are provided at the upper part of the unit formed by the halves 13 and 14 and these flange members may be welded together and secured to the intermediate wall 3 in the manner shown. By, having a flat surface 14 at the top as well as at the bottom, it will be obvious that the sharp freezing containers will be in closer contact withthe walls of the shar freezing chamber whereby to effect a mucli quicker heat transfer and subsequent freezing of the ice cubes or other material.

In Fig. 5 I have illustrated a further modified manner of forming the interior shell 4 and the intermediate shell 3. In this case the two shells are preferably formed from one sheet of metal joined together atthe point 16.

.It will thus be seen that I have provided an extremely inexpensive, easily assembled, and compact cooling unit. The walls of the shar freezing chamber or chambers are so-fabricated' as to best conform with the shape of the sharp freezing container or containers whereby to effect a rapid transfer of heat. The

cooling medium is positioned immediately ad jacent the wall of the sharp freezing chamber whereby to insure and maintain a relatively low temperature. The cooling medium is immediate y surrounded by a large mass of stone which while it 4 acts as a ood conductor whereby to efiect transfer 0% heat units be- This structure will also assist in cor-' said flat bottom,

tween the cooling medium and the interior of the space to be cooled, at the same time acts as an efficient hold-over whereby to maintain a given temperature for a relatively long time. This will permit the use ofa relatively small amount of refrigerant in the cooling unit and will also permit of the maintaining of a higher temperature in the surrounding atmosphere.

What I claim is:

' 1. A cooling unit for refrigerating systems formed of three shells, the inner shell being open and adapted to receive a member to be cooled, a body of refrigerant around said inner shell and confined by the second shell, a mass of stone surrounding said second shell, and means forming a part of said inner shell and connected to the second shell" for reinforcing the inner shell against collapsing.

2. A cooling unit for refrigerating systems formed of three shells,

the inner shell being open: and adapted to receive a member to be cooled, a body of refrigerant around said inner shell and confined by thesecond shell, a mass of stone surrounding said second shell and confined by a third shell, and means forming a part of said inner shell and connected to the second shell for reinforcing the inner shell against collapsing.

3. ,A cooling unit for refrigeratingsystems formed of three shells, the inner shell being open and adapted to receive a member to be cooled, a body of refrigerant around said inner shell and confined by the second shell, a

mass of stone surrounding said second shell," and means connected to said inner-shell and to said second shell for positioning the inner shell within the second shell.

4-. A cooling unit for refrigerating systems, comprislng in combination an inner substantially c lindrical shell, a flat bottom formed in sai shell for receiving a sharp' freezing container and providing relatively great surface contact therebetween, a substantially cylindrical shell surrounding said first shell, and means connecting said flat bottom with said outer shell whereby to reinforce and a mass of refrigerant confined between said two shells.

5. A cooling unit for refrigerating systems, comprism in combinatlon an inner substantially cyllndrical'shell, a flat bottom formed in said shell for receiving a sharp freezing container and providing relatively I great surface contact therebetween, a substantially cylindrical shell surrounding said first shell, and means connecting said fiat bottom with said outer shell whereby to reinforce said flat bottom and position said in ner, shell centrally of the outer shell, and a mass of refrigerant confined between'said two shells comprising an inner shell formed with a sub- 6. cooling unit for refrigerating systems ate shells aced circumferentially around said inner she I, said inner shell terminating in two flanges welded to ether and in turn secured to said interme iate shell whereby to reinforce the inner shell and position the same within the intermediate shell, and a mass of stone plastically applied around the intermediate shell and allowed to harden.

7. A cooling unit for refrigeratin systems comprising a pair of spaced shells a apted to receive a refrigerant, said inner shell havin a portion'of the surface thereof flattened an reinforced against collapsin said reinforcing portion being connecte to said outer shell, and a mass of material surrounding the outer shell, said material having relatlvely good heat conducting and hold-over properties.

In testimony whereof I afiix my si ature. LLOYD G. CO E N. 

